1400139988 has 18 divisors (see below), whose sum is σ = 2653225134. Its totient is φ = 646218144.

The previous prime is 1400139971. The next prime is 1400139991. The reversal of 1400139988 is 8899310041.

It can be written as a sum of positive squares in 3 ways, for example, as 6461764 + 1393678224 = 2542^2 + 37332^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1034931 + ... + 1036282.

Almost surely, 2^1400139988 is an apocalyptic number.

It is an amenable number.

1400139988 is a deficient number, since it is larger than the sum of its proper divisors (1253085146).

1400139988 is a wasteful number, since it uses less digits than its factorization.

1400139988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2071243 (or 2071228 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 1400139988 is about 37418.4444893157. Note that the first 4 decimals coincide. The cubic root of 1400139988 is about 1118.7262272738.

The spelling of 1400139988 in words is "one billion, four hundred million, one hundred thirty-nine thousand, nine hundred eighty-eight".